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          <h1 class="post-title" itemprop="name headline">使用seajs的总结</h1>
        

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        <h1 id="使用seajs的总结"><a href="#使用seajs的总结" class="headerlink" title="使用seajs的总结"></a>使用seajs的总结</h1><h4 id="好处：使用seajs的好处-不用担心被引入js文件的依赖问题"><a href="#好处：使用seajs的好处-不用担心被引入js文件的依赖问题" class="headerlink" title="好处：使用seajs的好处 不用担心被引入js文件的依赖问题"></a>好处：使用seajs的好处 不用担心被引入js文件的依赖问题</h4><a id="more"></a>
<ul>
<li><p>首先 引入文件</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">  //引入文件</div><div class="line">&lt;script src=&quot;js/sea.js&quot;&gt;&lt;/script&gt;</div><div class="line">&lt;script&gt;</div><div class="line">//启动模块</div><div class="line">  seajs.use(&apos;./js/main.js&apos;)</div><div class="line">&lt;/script&gt;</div></pre></td></tr></table></figure>
</li>
<li><p>将程序的文件都划分成多个模块</p>
</li>
<li>seajs 专注于解决 JavaScript 模块</li>
<li>一个 JavaScript 文件就是一个模块</li>
<li>使用 seajs 可以通过 seajs.use(‘js的路径’) 去启动你的模块</li>
<li><p>然后每一个模块的js代码都写到 define 函数的回调函数中</p>
<ul>
<li>define模板<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">define(function (require, exports, module) &#123;</div><div class="line">    &lt;!--js代码--&gt;</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
</li>
</ul>
</li>
<li><p>每一个模块都是私有作用域，完全封闭，默认只有在内部访问内部成员</p>
</li>
<li>外部无法访问模块内部成员，而模块也不会污染外部</li>
<li><p>seajs 专门为模块提供了固定的通信规则</p>
<ul>
<li><p>define 函数的回调函数需要接收三个参数：</p>
<ul>
<li><p>require 是一个函数，作用：用于加载模块</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line">require(&apos;路径&apos;) 返回值 return module.exports</div><div class="line"></div><div class="line"> 1. 加载并执行指定模块代码</div><div class="line">  2. 得到模块的导出接口对象 module.exports</div><div class="line">  3. 返回值是一个对象</div></pre></td></tr></table></figure>
</li>
<li><p>module 是一个对象，该对象中有一个成员叫做：exports ；默认模块最后会 return module.exports</p>
</li>
</ul>
</li>
</ul>
</li>
<li><p>exports 与 module.exports 关系</p>
<ul>
<li>exports === module.exports</li>
<li>也就意味着修改 exports 也会影响 module.exports</li>
<li>给 exports 重新赋值不管用，因为模块最终导出的是 module.exports</li>
<li>所以如果你希望一个模块仅仅导出单一成员（而不是一个对象），则必须为 module.exports 重新赋值才可以</li>
</ul>
</li>
<li>综上所述，咱们在使用的是，只需要做到以下 4 点就可以了：<ul>
<li>seajs.use() 启动模块系统</li>
<li>把所有的模块都写到 define 函数中</li>
<li>如果需要依赖项，则使用 require 进行加载</li>
<li>如果需要进行模块接口导出，则手动往 module.exports 上挂载成员即可<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">module.exports = function () &#123;</div><div class="line">    console.log(&apos;hello foo&apos;)</div><div class="line">&#125;</div></pre></td></tr></table></figure>
</li>
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